The following bibliography has been generated by bringing together all references provided by our content partners. There may be duplication.


  • 1. National Biodiversity Network Species Dictionary (Feb 2003) External link.
  • 1996. database, The PLANTS Database
  • 1996. database, NODC Taxonomic Code
  • 2. Clapham, A.R., Tutin, T.G. & Moore, D.M. (1987) Flora of the British Isles. 3rd Edition. Cambridge University Press, Cambridge.
  • 2000. database, The PLANTS Database
  • 2011. Lamiales of North America Update
  • 3. Preston, C.D., Pearman, D.A. & Dines, T.D. (2002) The New Atlas of the British and Irish Flora. Oxford University Press, Oxford.
  • 4. Mabey, R. (1996) Flora Britannica. Sinclair-Stevenson, London.
  • 5. Press, B. & Gibbons, B (1993) Photographic field guide to wild flowers of Britain and Europe. New Holland Publishers (UK) Ltd, London.
  • 6. Paul May (1996) University of Bristol School of Chemistry. (Feb 2003) External link.
  • AFPD. 2008. African Flowering Plants Database - Base de Donnees des Plantes a Fleurs D'Afrique.
  • Barringer, K. Scrophulariaceae. In: Hammel, B.E.; Grayum, M.H.; Herrera, C.; Zamora, N. (eds.). Manual de Plantas de Costa Rica. Monogr. Syst. Bot. Missouri Bot. Gard. En preparación.
  • CONABIO. 2009. Catálogo taxonómico de especies de México. 1. In Capital Nat. México. CONABIO, Mexico City.
  • Digitalis purpurea L.
  • Hokche, O., P. E. Berry & O. Huber. (eds.) 2008. Nuevo Cat. Fl. Vasc. Venez. 1–860. Fundación Instituto Botánico de Venezuela, Caracas.
  • Idárraga-Piedrahita, A., R. D. C. Ortiz, R. Callejas Posada & M. Merello. (eds.) 2011. Fl. Antioquia: Cat. 2: 9–939. Universidad de Antioquia, Medellín.
  • Luteyn, J. L. 1999. Páramos, a checklist of plant diversity, geographical distribution, and botanical literature. Mem. New York Bot. Gard. 84: viii–xv, 1–278.
  • Marticorena C & R Rodríguez . 1995-2005. Flora de Chile. Vols 1, 2(1-3). Ed. Universidad de Concepción, Concepción. 351 pp., 99 pp., 93 pp., 128 pp. Matthei O. 1995. Manual de las malezas que crecen en Chile. Alfabeta Impresores. 545 p.
  • Orrell T. (custodian) (2015). ITIS Regional: The Integrated Taxonomic Information System (version Dec 2014). In: Species 2000 & ITIS Catalogue of Life, 26th August 2015 (Roskov Y., Abucay L., Orrell T., Nicolson D., Kunze T., Flann C., Bailly N., Kirk P., Bourgoin T., DeWalt R.E., Decock W., De Wever A., eds). Digital resource at Species 2000: Naturalis, Leiden, the Netherlands. ISSN 2405-8858.
  • Species Plantarum 2: 621–622. 1753. (1 May 1753) (Sp. Pl.)
  • Zuloaga, F. O., O. N. Morrone, M. J. Belgrano, C. Marticorena & E. Marchesi. (eds.) 2008. Catálogo de las plantas vasculares del Cono Sur. Monogr. Syst. Bot. Missouri Bot. Gard. 107(1–3): i–xcvi, 1–3348.


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